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Diesel used to have iron-on patches on jeans with rip or holes (ie 71j, 73j), but not that much anymore. It's a great way to prevent the rip/holes gets bigger from wear especially over the knee. They are inexpensive, comes in different colors and easy DIY

Maybe you think that's nothing, but in real view it's easy recognizable, also the hole can increase.

Up to white iron patches I don't find a decent solution (i've searched in german amazon and so on). Also I think a small white iron patch wouldn't fit. Is it sure, that scalled-down iron patches also works?